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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ec44ea52b0c2358f71980bd5a4978f3441eab807c53e3f17698b87de9ba076' 
  AND token = 'PN1A1WE2l+DhvMaTlhH3xYX/ICH50qO5XbbYA78vTy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}